A Christmas tree stands in Pioneer square on Saturday Nov. 27, 2010 in Portland, Ore., the morning after a car bomb plot was foiled during the annual tree lighting ceremony. Federal agents in a sting operation arrested a Somali-born teenager just as he tried blowing up a van he believed was loaded with explosives at the crowded event, authorities said. (AP Photo/Greg Wahl-Stephens)

Photo by: Greg Wahl-Stephens

A Christmas tree stands in Pioneer square on Saturday Nov. 27, 2010 in Portland, Ore., the morning after a car bomb plot was foiled during the annual tree lighting ceremony. Federal agents in a sting operation arrested a Somali-born teenager just as he tried blowing up a van he believed was loaded with explosives at the crowded event, authorities said. (AP Photo/Greg Wahl-Stephens)